A case should be a - void when the zero positions of incident wavefront are concurrent with actuator that causes failure of compensation.
存在一类特殊情况，当入射波前的零点恰好通过各变形镜所在位置，补偿拟合基本失效，应注意避免。
For the TE wave or the TM wave, the reflection coefficient will become zero at a certain incident Angle.
不论是TE波还是TM波，当以某一入射角入射时，反射系数都有可能变为零。
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